US11177336B2 - Display substrate, repairing method thereof and display panel - Google Patents
Display substrate, repairing method thereof and display panel Download PDFInfo
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- US11177336B2 US11177336B2 US16/334,551 US201816334551A US11177336B2 US 11177336 B2 US11177336 B2 US 11177336B2 US 201816334551 A US201816334551 A US 201816334551A US 11177336 B2 US11177336 B2 US 11177336B2
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/131—Interconnections, e.g. wiring lines or terminals
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/861—Repairing
Definitions
- the present disclosure relates to the technical field of displays, in particular to a display substrate, a repairing method thereof and a display panel.
- the display substrate is provided with scanning signal lines and data signal lines therein, and when the scanning signal lines and the data signal lines have a circuit breaking fault or short-circuit fault, bright lines or dark lines exist in the display panel adopting the display substrate during display, thus decreasing the yield of the display panel.
- the present disclosure provides a display substrate, a repairing method thereof, and a display panel.
- a method for repairing a display substrate wherein the display substrate includes a substrate which is provided thereon with:
- the signal lines including signal lines extending along a transverse direction of the substrate and signal lines extending along a longitudinal direction of the substrate, which are insulated from each other;
- drive power lines including drive power lines extending along the transverse direction of the substrate and drive power lines extending along the longitudinal direction of the substrate, which are mutually connected and are used for providing a driving voltage to each light emitting unit, wherein the drive power lines are insulated from the signal lines,
- Step S0 detecting whether there is a fault point on the signal lines
- Step S1 when a fault point is detected on a signal line, two sides of at least one fault point are short-circuited through line portions of two drive power lines respectively located at two sides of the at least one fault point and perpendicular to the signal line where the at least one fault point is located and a line portion of a drive power line located at one side of the at least one fault point and parallel to the signal line where the at least one fault point is located.
- the two drive power lines located at the two sides of at least one fault point respectively and perpendicular to the signal line where the at least one fault point is located are referred to as first repair lines
- the one drive power line located at one side of the at least one fault point and parallel to the signal line where the at least one fault point is located is referred to as a second repair line
- the step S1 comprises:
- step S1 further comprises:
- step S1 further comprises:
- two welded positions are set, and the two welded positions are positioned at two ends of all the plurality of fault points along an extending direction of the signal line where the fault point is located;
- the plurality of fault points are divided into at least two fault point groups, so that each fault point group comprises one fault point or a plurality of fault points, the distance between every two adjacent fault points in one fault point group is less than or equal to the first preset value, the distance between fault points in different fault point groups is greater than the first preset value, and two welded positions are respectively set for each fault point group, and the two welded positions are positioned at two ends of all the fault points in each fault group along the extending direction of the signal line where the fault points are located.
- disconnecting the extension lines of the line portions of the first repair lines for short-circuiting by laser respectively comprises, disconnecting extension lines of short-circuited line portions of two drive power lines which are located at two sides of the fault point and perpendicular to the signal line where the fault point is located and closest to the fault point;
- disconnecting the extension lines at two sides of the line portion of the second repair line for short-circuiting by laser comprises: disconnecting extension lines at two sides of short-circuited line portion of the drive power line which is located at one side of the fault point, parallel to the signal line where the fault point is located and closest to the fault point.
- a display substrate such as an AMOLED display substrate, comprising a substrate which is provided with thereon:
- the signal lines including signal lines extending along a transverse direction of the substrate and signal lines extending along a longitudinal direction of the substrate, which are insulated from each other;
- drive power lines including drive power lines extending along the transverse direction of the substrate and drive power lines extending along the longitudinal direction of the substrate, which are mutually connected, and are used for providing a driving voltage to each light emitting unit, wherein the drive power lines are insulated from the signal lines,
- the two sides of the at least one fault point are short-circuited through line portions of two drive power lines respectively positioned at two sides of the at least one fault point and perpendicular to the signal line where the at least one fault point is located and a line portion of a drive power line positioned at one side of the at least one fault point and parallel to the signal line where the at least one fault point is located.
- the two drive power lines located at two sides of at least one fault point and perpendicular to the signal line where the at least one fault point is located are referred to as first repair lines
- the one drive power line located at one side of the at least one fault point and parallel to the signal line where the at least one fault point is located is referred to as a second repair line
- the first repair lines and the signal line where the fault point is located are respectively welded in the thickness direction of the substrate.
- extension lines at two sides of the short-circuited line portions of the first repair lines are disconnected respectively; the extension lines at two sides of the short-circuited line portion of the second repair line are disconnected respectively.
- the first repair lines are two drive power lines which are respectively located at two sides of the fault point, and perpendicular to the signal lines where the fault point is located and closest to the fault point;
- the second repair line is a drive power line located at one side of the fault point, parallel to the signal line where the fault point is located and closest to the fault point.
- the line portions between the fault point and the welded positions of the signal line where the fault point is located are disconnected.
- the number of the at least one fault point is a plurality, the distance between every two adjacent fault points is less than or equal to a first preset value, and the welded positions are two, and the two welded positions are positioned at the two ends of all the plurality fault points along the extending direction of the signal line where the fault points are located.
- the number of the at least one fault point is a plurality, the distance between some adjacent fault points of the plurality of fault points is greater than the first preset value, the plurality of fault points are located in at least two fault point groups, each fault point group comprises one fault point or a plurality of fault points, the distance between every two adjacent fault points in each fault point group is less than or equal to the first preset value, the distance between two fault points in different fault point groups is greater than the first preset value, and each fault point group is provided with two welded positions respectively, and the two welded positions are located at two ends of all the fault points in the fault point group along the extending direction of the signal line where the fault points are located.
- each row of light-emitting units along a transverse direction of the substrate and/or each column of light-emitting units along a longitudinal direction of the substrate comprise corresponding two parallel driving power lines.
- the fault point is a circuit breaking point or a short-circuit point.
- a display panel such as an AMOLED display panel, comprising the above-mentioned display substrate.
- FIG. 1 is a schematic view of a display substrate in one embodiment provided by the present disclosure
- FIG. 2 is a sectional view taken along a direction A-A in FIG. 1 ;
- FIG. 3 is a schematic view of a display substrate in another embodiment provided by the present disclosure.
- FIG. 4 is a schematic view of a display substrate in yet another embodiment provided by the present disclosure.
- FIG. 5 is a schematic view of a display substrate in another embodiment provided by the present disclosure.
- FIG. 6 is a schematic view of a display substrate in a further embodiment provided by the present disclosure.
- FIG. 7 is a schematic view of a display substrate in yet another embodiment provided by the present disclosure.
- FIG. 8 is a schematic flow chart of a method for repairing a display substrate according to an embodiment of the present disclosure.
- an embodiment of the present disclosure provides a method for repairing a display substrate.
- the display substrate includes a substrate which is provided with thereon:
- the signal lines including signal lines extending along a transverse direction of the substrate and signal lines extending along a longitudinal direction of the substrate, which are insulated from each other;
- drive power lines including drive power lines extending along the transverse direction of the substrate and drive power lines extending along the longitudinal direction of the substrate, which are mutually connected and are used for providing a driving voltage to each light emitting unit, wherein the drive power lines are insulated from the signal lines,
- step S0 detecting whether there is a fault point on the signal lines
- step S1 when a fault point is detected on a signal line, two sides of the at least one fault point are short-circuited through line portions of two drive power lines respectively located at two sides of the at least one fault point and perpendicular to the signal line where the at least one fault point is located and a line portion of a drive power line located at one side of the at least one fault point and parallel to the signal line where the at least one fault point is located.
- the display panel mainly includes a display substrate and a cover plate glass.
- the display substrate is provided with a plurality of light emitting units, which are generally arranged in a matrix.
- the light emitting units are, for example, organic light emitting units, quantum dot light emitting units or LED light emitting units, etc.
- the display substrate may also include drive circuits, which generally includes switching transistors and driving transistors, and the display substrate further includes signal lines, drive power lines, etc.
- the AMOLED (Active Matrix/Organic Light Emitting Diode) display panel is a display panel with active matrix organic light emitting diodes.
- the display panel mainly includes an AMOLED display substrate (hereinafter referred to as the display substrate) and a cover glass.
- a plurality of organic light emitting units are arranged on the display substrate.
- Each organic light emitting unit mainly includes an organic light emitting diode, a driving circuit and the like, and the driving circuit usually includes a switching transistor and a driving transistor.
- the signal lines usually include a plurality of scanning signal lines and a plurality of data signal lines.
- the scanning signal lines generally extend along a transverse direction of the substrate.
- the gates of all switching transistor located in a transverse row are connected in parallel by a scanning signal line.
- Each scanning signal line is used for transmitting scanning signals, providing switching voltages to the gates of all the switching transistor connected with the scanning signal line, and controlling each switching transistor connected with the scanning signal line to be turned on or off.
- the data signal lines generally extend along the longitudinal direction of the substrate.
- the drains of all switching transistors located in one longitudinal column are connected in parallel by a data signal line.
- Each data signal line is used for transmitting data signals, providing pixel voltages to the sources of all the switching transistors connected with the data signal line, and controlling the brightness of each organic light emitting unit.
- the scanning signal lines may be arranged to extend in the longitudinal direction of the substrate, and the data signal lines may be arranged to extend in the transverse direction of the substrate, and this embodiment is not limited in this respect.
- Driving power lines also called VDD lines, are connected to the source of each driving transistor, and provide driving voltages for each light emitting diode through each driving transistor to control each light emitting unit to emit light.
- the drive power lines include drive power lines extending along the transverse direction of the substrate and drive power lines extending along the longitudinal direction of the substrate, and the drive power lines in both directions are connected to each other to form a mesh wiring to provide a driving voltage to each light emitting unit.
- the drive power lines are usually uniformly distributed, which can avoid the inconsistency of the driving voltages caused by voltage drop of the drive power lines and improve the display uniformity.
- each organic light emitting unit may further include a compensating transistor and a sensing transistor or other circuit structure, etc.
- corresponding sensing signal lines or other types of signal lines extending along the transverse direction or along the longitudinal direction of the substrate may be provided on the substrate according to actual needs.
- the signal lines in this embodiment may include various types of signal lines, for example, the above-mentioned scanning signal lines, data signal lines, sensing signal lines, and the like.
- the transverse direction of the substrate usually refers to a long-side direction of the substrate, while the longitudinal direction of the substrate usually refers to a short-side direction of the substrate.
- the longitudinal direction and the transverse direction of the substrate are only relative concepts, referring to two mutually perpendicular directions.
- the display substrate includes a plurality of signal lines.
- Existing methods can be used to detect the display substrate.
- a fault point is detected on a signal line, for example, when there is a circuit breaking point in a signal line or a short-circuit point between adjacent signal lines, the display panel using the display substrate will have bright lines or dark lines during display, and the display panel will be regarded as defective or unqualified products, thus decreasing the yield of the display panel.
- one signal line may be found to have a fault point, or a plurality of signal lines may also be found to have fault points.
- the same repairing method can be used for repairing the fault point(s) of each signal line.
- the signal line where the fault point is located can be repaired by short-circuiting two sides of the fault point by using line portions of two drive power lines which are respectively positioned at two sides of the fault point and are perpendicular to the signal line where the fault point is located and a line portion of one drive power line which is positioned at one side of the fault point and is parallel to the signal line where the fault point is located.
- the signal transmitted in the signal line no longer passes through the position of the fault point, but instead passes through the line portions of the drive power lines short-circuiting the fault point. Therefore, the repaired signal line can normally transmit signals, so that bright lines or dark lines do not exist during display, thereby increasing the yield of the display substrate and the yield of the display panel adopting the display substrate.
- a repairing method provided by an embodiment of the present disclosure will be described below with reference to FIGS. 1 and 2 .
- FIG. 1 is a schematic view of a display substrate provided in an embodiment of the present disclosure
- FIG. 2 is a cross-sectional view taken along direction A-A in FIG. 1
- FIGS. 1 and 2 only schematically show signal lines and drive power lines on the display substrate, omitting other structures on the display substrate, such as organic light emitting diodes, driving transistors, etc.
- the display substrate includes a substrate 10 on which a plurality of light emitting units (not shown) are disposed.
- the substrate 10 is also provided with a plurality of signal lines, and the signal lines include signal lines S 1 -Sn extending along a transverse direction of the substrate 10 and signal lines D 1 -Dn extending along a longitudinal direction of the substrate 10 , which are insulated from each other.
- Each organic light emitting unit is located in each area defined by intersections of the transversely extending signal lines S 1 -Sn and the longitudinally extending signal lines D 1 -Dn, for example, each rectangular area (dot areas P 1 , P 2 , P 3 , and P 4 in FIG. 1 ) defined by intersections of the signal lines S 1 -Sn and the signal lines D 1 -Dn in the figure.
- the substrate 10 is also provided with a plurality of driving power lines, and the driving power lines are used for providing driving voltage for each light emitting unit.
- the drive power lines are insulated from the signal lines, and comprises drive power lines V 11 -V 1 n extending along the transverse direction of the substrate 10 and drive power lines V 21 -V 2 n extending along the longitudinal direction of the substrate 10 , which are connected with each other.
- Step S1 in the above embodiment may be: when a fault point is detected on a signal line, for example, when a fault point N 1 is detected on a signal line D 4 extending along the longitudinal direction of the substrate 10 shown in FIG. 1 , at this time, two drive power lines V 12 and V 13 located at two sides of the fault point N 1 and perpendicular to the signal line D 4 where the fault point N 1 is located may be welded with the signal line D 4 where the fault point N 1 is located in the thickness direction of the substrate 10 , respectively.
- the drive power lines (only the drive power lines V 11 -V 1 n extending along the transverse direction of the substrate 10 are shown in FIG. 2 ) are insulated from the signal lines S 1 -Sn extending along the transverse direction of the substrate 10 by a first insulating layer 11 disposed therebetween.
- the drive power lines V 21 -V 2 n extending along the longitudinal direction of the substrate 10 are insulated from the signal lines S 1 -Sn by the first insulating layer 11 .
- the drive power lines (only the drive power lines V 11 -V 1 n extending along the transverse direction of the substrate 10 are shown in FIG. 2 ) are insulated from the signal lines extending along the longitudinal direction of the substrate 10 (only one D 4 of the signal lines is shown in FIG. 2 ) by a second insulating layer 12 therebetween.
- the signal lines D 1 -Dn extending along the longitudinal direction of the substrate 10 are also insulated from the drive power lines by the second insulating layer 12 .
- Signal lines S 1 -Sn extending along the transverse direction of the substrate 10 are insulated from signal lines D 1 -Dn extending along the longitudinal direction of the substrate 10 by the first insulating layer 11 and the second insulating layer 12 therebetween.
- FIG. 2 shows only one positional relationship between signal lines and drive power lines, i.e., signal lines S 1 -Sn extending along the transverse direction of the substrate 10 , drive power lines (only drive power lines V 11 -V 1 n extending along the transverse direction are shown in FIG. 2 ) and signal lines extending along the longitudinal direction of the substrate 10 (only one signal line D 4 is shown in FIG. 2 ) are sequentially arranged on the substrate 10 .
- the positional relationship of the above three types of lines may be arranged in other ways as long as the three type of lines are insulated from each other, and this embodiment is not limited in this respect.
- two drive power lines V 12 and V 13 (respectively referred to as first repair lines) located at two sides of the fault point N 1 and perpendicular to the signal line D 4 where the fault point N 1 is located are respectively welded with the signal line D 4 where the fault point N 1 is located in the thickness direction of the substrate 10 .
- Welding refers to electrically connecting the first repair lines V 12 and V 13 and the signal line D 4 at two sides of the fault point N 1 in the thickness direction of the substrate 10 through a molten conductive material (e.g., the material of the signal line D 4 ), that is, the molten material of the signal line D 4 is filled in the insulating layer (e.g., the second insulating layer 12 shown in FIG. 2 ) between the first repair lines V 12 and V 13 and the signal line D 4 .
- a molten conductive material e.g., the material of the signal line D 4
- the welded positions include an intersection point M 1 of the orthographic projections of the first repair line V 12 and the signal line D 4 towards the substrate 10 and an intersection point M 2 of the orthographic projections of the other first repair line V 13 and the signal line D 4 towards the substrate 10 .
- the signal line D 4 has a signal flowing from top to bottom in an extending direction of the signal line (i.e., when the signal is input from the top of the signal line D 4 )
- the signal when the signal reaches the welded position M 1 , it does not pass through the fault point N 1 , instead it passes through a line portion between the welded position M 1 and F 1 in the first repair line V 12 after passing through the welded position M 1 .
- a second repair line located at one side of the fault point N 1 and parallel to the signal line D 4 , and then passes through a line portion located between F 2 and the welded position M 2 in the other first repair line V 13 .
- the signal passes through the welded position M 2 and flows along the signal line D 4 to the end of the signal line D 4 .
- the route through which the signal passes can be seen in a dashed line with arrow shown in FIG. 1 .
- the drive power lines located at two sides of the fault point are welded with the signal line where the fault point is located by laser, so that the signal line where the fault point is located can be repaired.
- step S1 in the repairing method may include:
- Step S2 disconnecting extension lines at two sides of the short-circuited line portions of the first repair lines by laser respectively;
- Step S3 disconnecting extension lines at two sides of the short-circuited line portion of the second repair line by laser respectively.
- the signal line can be repaired using line portions of the drive power lines.
- line portions of the first repair lines V 12 and V 13 and a line portion of the second repair line V 23 are short-circuited at two sides of the fault point N 1 .
- the first repair lines V 12 and V 13 and the second repair line V 23 can still provide driving voltages for the corresponding light emitting units.
- the short-circuited line portions (such as the line portion between M 1 and F 1 , the line portion between F 1 and F 2 , and the line portion between F 2 and M 2 shown in FIG. 1 ) may have signal of the signal line D 4 flowing through at the same time, the driving voltages of the driving power lines may be affected to some extent, but the effect is small because the signal flows through the signal line for a very short time.
- the extension lines at two sides of the short-circuited line portion (line portion M 1 -F 1 between M 1 and F 1 ) of the first repair line V 12 can be disconnected by laser respectively.
- the extension lines at two sides of the short-circuited line portion (line portion between M 1 and F 1 ) of the first repair line V 12 are disconnected respectively, and the disconnected positions are, for example, R 1 and R 2 .
- the extension lines at two sides of the short-circuited line portion (line portion M 2 -F 2 between M 2 and F 2 ) of the other first repair line V 13 are disconnected respectively.
- the extension lines at two sides of the short-circuited line portion (line portion M 2 -F 2 between M 2 and F 2 ) of the first repair line V 13 are disconnected respectively, and the disconnected positions are, e.g., R 3 and R 4 .
- the extension lines at two sides of the short-circuited line portion (line portion between F 1 and F 2 ) of the second repair line V 23 are also disconnected respectively.
- the extension lines at two sides of the short-circuited line portion (line portion F 1 -F 2 between F 1 and F 2 ) of the second repair line V 23 are disconnected respectively, and the disconnected positions are, e.g., R 5 and R 6 .
- the line portions other than the disconnected positions can still normally provide driving voltages to the corresponding light emitting units, so that the influence on the transmission of drive signals of the driving power lines after repairing can be minimized, and the repair effect can be improved.
- first repair lines are drive power lines V 22 and V 23
- a second repair line is a drive power line V 12
- welded positions include positions M 3 and M 4 on the signal line S 2 located at two sides of the fault point N 2
- extension lines at two sides of a short-circuited line portion (line portion F 3 -M 3 between F 3 and M 3 ) of the first repair line V 22 are disconnected respectively, and the disconnected positions are, e.g., R 7 and R 8
- extension lines at two sides of a short-circuit line (line portion F 4 -M 4 between F 4 and M 4 ) of the other first repair line V 23 , respectively are disconnected, and the disconnected positions are e.g., R 9 and R 10
- the first repair lines may be two drive power lines respectively located at two sides of the fault point, perpendicular to the signal line where the fault point is located and closest to the fault point.
- the second repair line may be a drive power line located at one side of the fault point, parallel to the signal line where the fault point is located, and closest to the fault point.
- disconnecting the extension lines at two sides of the short-circuited line portion of the first repair line by laser respectively as described in step S2 above may be:
- Disconnecting the extension lines at two sides of the short-circuited line portion of the second repair line by laser respectively in the above step S3, may be:
- the signal line D 4 has a fault point N 1
- the first repair lines V 12 and V 13 are the two first repair lines closest to the fault point N 1 , i.e., the two drive power lines located at two sides of the fault point N 1 , perpendicular to the signal line D 4 where the fault point is located, and closest to the fault point N 1
- the second repair line V 23 is a drive power line located at one side of the fault point N 1 , parallel to the signal line D 4 where the fault point N 1 is located, and closest to the fault point N 1 .
- the drive power lines closest to the fault point are taken as the first repair lines and the second repair lines.
- the first repair lines and the second repair line may be other drive power lines, for example, as shown in FIG. 1 , drive power lines V 11 and V 13 located at two sides of the fault point N 1 may be taken as the first repair lines, drive power line V 21 or V 22 located at the other side of the fault point N 1 may be taken as the second repair line.
- the signal line D 4 having the fault point can also be repaired.
- the present embodiment is not limited in this respect.
- the line portions short-circuiting the fault point are the shortest path lines, which can reduce the resistance difference between the repaired signal line and other signal lines and improve the display uniformity.
- the light emitting units (the position where each light emitting unit is located can be called a pixel) near the fault point N 1 may have abnormal display problems, which may be bright spots or dark spots (hereinafter referred to as bad pixels), for example, pixels P 1 , P 2 , P 3 and P 4 shown in FIG. 1 are bad pixels (four pixels filled with dots in FIG. 1 ).
- the number of bad pixels will be smaller. For example, as shown in FIG. 4 , assuming that the signal line D 4 also has a fault point N 1 , using the same repairing method, there will be only two bad pixels, pixels P 5 and P 6 .
- the distance and arrangement mode between each drive power line and each signal line may vary. Therefore, the number and location of bad pixels may be different after repairing the signal line where the fault point is located. However, the number of bad pixels after repairing is usually very small. For the entire display panel, there will be tens of thousands of pixels, and one pixel constitutes only a very small area of the entire display panel and is invisible to the naked eye.
- the overall display effect of the display panel will not be affected.
- Different display panels have different allowable number of bad pixels, and whether to repair or not can be decided according to the requirements of qualified products of the display panel. If the number of bad pixels after repairing is within the allowable range, the display substrate can be repaired, and the repaired display panel is qualified. If the number of bad pixels after repairing exceeds the allowable number range, the display substrate will not be repaired.
- signal lines may have fault points at a plurality of locations.
- two drive power lines i.e., two first repair lines located at two sides of each fault point and perpendicular to the signal line where the fault point is located may be welded with the signal line where the fault point is located in the thickness direction of the substrate, i.e., the two first repair lines located at two sides of each fault point can be welded with the signal line where the fault point is located in the thickness direction of the substrate respectively.
- two drive power lines i.e., two first repair lines located at two sides of the plurality of fault points on the same signal line and perpendicular to signal line where the plurality of fault points are located can be welded with the signal line where the fault points are located in the thickness direction of the substrate by laser, i.e., two first repair lines located at two sides of the plurality of fault points on the same signal line are welded with the signal line where the fault points are located in the thickness direction of the substrate respectively.
- the welded positions can be set according to two situations.
- a total of two welded positions can be provided, and all the plurality of fault points are located between the two welded positions along the extending direction of the signal line where the fault points are located, that is, the two welded positions are located at two ends of all the plurality of fault points along the extending direction of the signal line where the fault points are located.
- the two first repair lines at positions between which the plurality of fault points are located are welded with the signal line where the fault points are located in the thickness direction of the substrate.
- the signal line S 2 has four fault points N 3 , N 4 , N 5 and N 6 , and the distance between every two adjacent fault points is less than or equal to a certain first preset value (the first preset value can be set according to actual needs, for example, it can be set to the size of one pixel or several pixels), i.e. when the distribution of the plurality of the fault points is relatively dense, referring to FIG.
- two welded positions M 3 and M 4 may be provided only at two sides of two fault points N 3 and N 6 located at the two extreme ends of the plurality of fault points, and the four fault points N 3 , N 4 , N 5 and N 6 are located between the welded positions M 3 and M 4 , instead of providing welded positions at two sides of each fault point.
- the signal line S 3 has six fault points N 7 -N 12 .
- the welded positions may be M 5 and M 6 as shown in FIG. 5 .
- the number of allowed bad pixels after repairing should also be considered in determining whether the signal line to be repaired or not.
- the welded positions can be reduced, the repair process can be simplified, and the overall display effect of the display panel can be improved.
- the plurality of fault points can be divided into at least two fault point groups such that each fault point group includes one fault point or a plurality of fault points, and the distance between every two adjacent fault points in one fault point group is less than or equal to the first preset value, and the distance between fault points in different fault point groups is greater than the first preset value.
- two welded positions can be respectively set for each fault point group, and all fault points in the fault point group are between the two welded positions along the extending direction of the signal line where the fault points are located, that is, the two welded positions are located at two ends of all fault points in the fault point group along the extending direction of the signal line where the fault points are located.
- each fault point group two first repair lines at positions between which the plurality of fault points in the fault point group are located are welded with the signal line where the fault points are located in the thickness direction of the substrate.
- a signal line S 1 has five fault points N 13 , N 14 , N 15 , N 16 and N 17 , and the five fault points can be divided into two fault point groups, the first fault point group includes N 13 , N 14 and N 15 , the second fault point group includes N 16 and N 17 , and the distance between every two adjacent fault points in one fault point group is less than the first preset value, as shown in FIG. 5 , for example, the distance between N 13 and N 14 , the distance between N 14 and N 15 in the first fault point group is less than the first preset value; the distance between N 16 and N 17 in the second fault point group is less than the first preset value.
- both the first fault point group and the second fault point group may have only one fault point.
- the distance between two adjacent fault points in a fault point group can be considered as zero.
- the distance between a fault points in the first fault point group and a fault points in the second fault point group is greater than the first preset value, as shown in FIG. 5 , for example, the distance between N 15 and N 16 is greater than the first preset value.
- the welded positions are respectively set for each fault point group.
- the welded positions in the first fault point group are M 7 and M 8
- the welded positions in the second fault point group are M 9 and M 10 .
- the signal line S 1 can be repaired through the four welded positions.
- the fault points are grouped according to the density, thus simplifying the repair process and improving the overall display effect of the display panel.
- the fault points on signal lines mainly include two types: circuit breaking point and short-circuit point. If the fault point is a circuit breaking point, the signal line can be repaired by the repairing method in the above embodiments. If the fault point is a short-circuit point, furthermore, the repairing method may further include:
- step S4 disconnecting line portions between the fault point and the welded positions of the signal line where the fault point is located by laser, in this way, the line portions between the fault point and the welded positions of the signal line where the fault point is located are broken.
- a signal line When a signal line has a short-circuit point, there may be two situations. One is that there is a short-circuit between two adjacent signal lines due to foreign matters, such as residual metal materials or other foreign matters in the manufacturing process. In this case, the signal lines have a short-circuit point.
- FIG. 6 shows a situation where a short-circuit occurs between adjacent transversely extending signal lines.
- the signal line S 2 and the signal line S 3 have the same short-circuit point N 21 .
- the signal line S 2 is relatively distant from the signal line S 3 as shown in FIG. 6 . Therefore, the short-circuit point N 21 is identified at two positions. In practice, the distance between the signal line S 2 and the signal line S 3 is very small, and the short-circuit point N 21 is located on both the signal line S 2 and the signal line S 3 .
- two welded positions of the signal line S 2 are located at two sides of the short-circuit point N 21 on the signal line S 2 , for example, the welded positions include M 11 and M 12 , first repair lines are drive power lines V 22 and V 23 , a second repair line is a drive power line V 12 , wherein disconnected positions of one first repair line V 22 are R 13 and R 14 , disconnected positions of the other first repair line V 23 are R 15 and R 16 , and disconnected positions of the second repair line V 12 are R 17 and R 18 (as shown in FIG. 6 ).
- Two welded positions of the signal line S 3 are respectively located at two sides of the short-circuit point N 21 .
- the welded positions include M 13 and M 14 , wherein disconnected positions of one first repair line V 22 are R 13 and R 19 , disconnected positions of the other first repair line V 23 are R 15 and R 20 , and disconnected positions of the second repair line V 13 are R 21 and R 22 .
- the first repair lines of the signal line S 2 and the signal line S 3 are the same, and some of the disconnected positions of the two signal lines may coincide, for example, disconnected positions R 14 and R 16 are disconnected positions of the two signal lines at the same time.
- the positions between the short-circuit point N 21 and the welded positions are disconnected. If a signal of the signal line S 2 is input from the left side, it is only necessary to disconnect the line portion between the short-circuit point N 21 and the welded position M 11 , for example, the disconnected position is T 1 ; If a signal of the signal line S 2 is input from the right side, it is only necessary to disconnect the line portion between the short-circuit point N 21 and the welded position M 12 , for example, the disconnected position is T 2 . Therefore, the specific disconnected position can be selected according to the signal input mode of the signal line. Of course, regardless of which side of the signal line the signal is input from, it can be disconnected both at T 1 and T 2 at the same time.
- the signal line S 3 line portions between the short-circuit point N 21 and the welded positions are disconnected. If a signal of the signal line S 3 is input from the left side, it is only necessary to disconnect the line portion between the short-circuit point N 21 and the welded position M 13 , for example, the disconnected position is T 3 ; If a signal of the signal line S 3 is input from the right side, it is only necessary to disconnect the line portion between the short-circuit point N 21 and the welded position M 14 , for example, the disconnected position is T 4 , or it can be disconnected both at T 3 and T 4 at the same time.
- each row of light emitting units extending along the transverse direction of the substrate and/or each column of light emitting units extending along the longitudinal direction of the substrate comprise two drive power lines arranged in parallel.
- each transverse row of light emitting units and each longitudinal column of the light emitting units in this embodiment include two drive power lines arranged in parallel. After the drive power lines serving as the first repair lines and the second repair line are disconnected, the other drive power line parallel to the disconnected first repair lines (or the second repair line) can provide drive signals to the light emitting units between the disconnected positions, so that the provision of drive signals to the light emitting units between the disconnected positions by the drive power lines will not be influenced. Bad pixels caused by disconnection of the drive power lines serving as the first repair lines and the second repair line are avoided, and the number of bad pixels is reduced.
- a plurality of signal lines are formed on a substrate 10 , and the signal lines include signal lines S 1 -Sn extending along a transverse direction of the substrate 10 and signal lines D 1 -Dn extending along a longitudinal direction of the substrate 10 .
- Each transversely extending signal line S 1 -Sn is used to provide corresponding signals (e.g., scanning signals) to each light emitting unit (not shown) of each transverse row, and each longitudinally extending signal line D 1 -Dn is used to provide corresponding signals (e.g., data signals) to each light emitting unit of each longitudinal column.
- Each light emitting unit is located in each area defined by intersections of transversely extending signal lines S 1 -Sn and longitudinally extending signal lines D 1 -Dn, for example, each rectangular area P 7 defined by intersections of signal lines S 1 -Sn and signal lines D 1 -Dn in FIG. 7 ;
- a plurality of drive power lines are also formed on the substrate 10 .
- Each row of light emitting units along the transverse direction of the substrate 10 and each column of light emitting units along the longitudinal direction of the substrate 10 comprise two parallel drive power lines.
- the vicinity of each transverse signal line Sn comprises two drive power lines V 1 n and V 1 n 0 , and the two drive power lines are two parallel drive power lines for each corresponding transverse row of light emitting units.
- the vicinity of each longitudinal signal line Dn includes two parallel drive power lines V 2 n and V 2 n 0 , and the two drive power lines are two parallel drive power lines for each corresponding longitudinal column of light emitting units.
- the signal line D 3 can be repaired by the method in the above embodiment, with the drive power lines V 120 and V 13 serving as the first repair lines, the drive power line V 23 serving as the second repair line, the welded positions being M 15 and M 16 respectively, and the disconnected positions of the first repair line V 120 being e.g., R 23 and R 24 ; the disconnected positions of the other first repair line V 13 are, e.g., R 25 and R 26 ; the disconnected positions of the second repair line V 23 are, for example, R 27 and R 28 .
- the route through which the signal in the signal line D 3 passes can be seen in a dashed line with arrow shown in FIG. 7 .
- the first repair lines V 120 and V 13 and the second repair line V 23 are disconnected at extension lines at two sides of their short-circuited line portions, respectively, and signal in the drive power lines cannot pass through the line portions between the disconnected positions, for example, the line portion between R 23 and R 24 , the line portion between R 25 and R 26 , and the line portion between R 27 and R 28 .
- the first repair line V 120 there is one drive power line V 12 parallel to it as a backup line.
- the drive signal cannot pass through the line portion between the two disconnected positions through which the first repair line V 120 passes, i.e., the line portion between R 23 and R 24 , since the drive power lines are connected to each other, the drive signal can be transmitted to the backup drive power line V 12 through other drive power lines, and through the backup drive power line V 12 , the drive signal can still be supplied to the light emitting unit through which the line portion between R 23 and R 24 passes.
- the other first repair line V 13 also has a drive power line V 130 parallel to it as a backup drive power line.
- the drive signal can be transmitted to the backup drive power line V 130 through other drive power lines, and through the backup drive power line V 130 , the drive signal can still be supplied to the light emitting unit through which the line portion between R 25 and R 26 passes.
- the second repair line V 23 there is also a drive power line V 230 parallel to it as a backup drive power line.
- Drive signals can be transmitted to the backup drive power line V 230 through other drive power lines. Through the backup drive power line V 230 , drive signals can still be supplied to the light emitting unit through which the line portion between R 27 and R 28 passes.
- the pixel P 7 is still a bad pixel because the signal in the signal line D 3 cannot pass through the position where the pixel P 7 is located, but other pixels near the fault point N 22 can be normally displayed and are not bad pixels. If the distance between the drive power lines is the distance shown in FIG. 4 , there will be no bad pixels after the above repairing.
- each row of light emitting units includes two corresponding drive power lines, after repairing, the number of bad pixels is reduced compared with the situation without backup drive power lines before. Therefore, the solution of this embodiment can reduce the number of bad pixels, improve the repair effect, and improve the yield of the display substrate.
- the above structure of the display substrate shown in FIGS. 1-7 only schematically represents each signal line, drive power line, fault point, welded position and disconnected position, etc.
- the above-mentioned structures are microscopic structures and are invisible to the naked eye. Therefore, it can be understood that the display substrate repaired according to the above-solution will not affect the overall display effect of the display panel using the display substrate.
- the signal line where the fault point is located is repaired by laser. Because of high collimation of laser, the corresponding welded or disconnected positions can be accurately positioned, and the repair effect can be improved.
- the signal line where the fault point is located can be repaired by short-circuiting two sides of the at least one fault point through line portions of two drive power lines which are respectively located at two sides of the at least one fault point and perpendicular to the signal line where the at least one fault point is located and a line portion of a drive power line which is located at one side of the at least one fault point and parallel to the signal line where the at least one fault point is located.
- the signal transmitted in the signal line no longer passes through the position of the fault point, but instead passes through line portions of the drive power lines short-circuiting the fault point, and the repaired signal line can normally transmit signals, so that bright lines or dark lines do not exist during display, thereby improving the yield of the display substrate and the yield of the display panel using the display substrate.
- the embodiment of the present disclosure also provides a display panel, which includes the display substrate of any of the above embodiments.
- the display panel can be used as electronic paper, mobile phone, tablet computer, television, display, notebook computer, digital photo frame, navigator and other product or component with display functions.
Abstract
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CN201711026409.0A CN107731878B (en) | 2017-10-27 | 2017-10-27 | Display substrate, repairing method thereof and display panel |
PCT/CN2018/103378 WO2019080640A1 (en) | 2017-10-27 | 2018-08-31 | Display substrate and repairing method therefor and display panel |
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US11818929B2 (en) | 2020-10-21 | 2023-11-14 | Lg Display Co., Ltd. | Display device with repair patterns |
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CN107731878B (en) * | 2017-10-27 | 2020-04-28 | 京东方科技集团股份有限公司 | Display substrate, repairing method thereof and display panel |
CN108877644A (en) * | 2018-07-20 | 2018-11-23 | 京东方科技集团股份有限公司 | Array substrate and the method for repairing array substrate |
KR102578708B1 (en) * | 2018-09-03 | 2023-09-15 | 엘지디스플레이 주식회사 | Light Emitting Display and Driving Method Thereof |
CN109390304B (en) * | 2018-10-11 | 2024-02-09 | 长鑫存储技术有限公司 | Semiconductor structure, memory device, semiconductor device and manufacturing method thereof |
KR102628847B1 (en) * | 2019-06-12 | 2024-01-25 | 삼성디스플레이 주식회사 | Display device |
CN113516917B (en) * | 2021-05-26 | 2023-05-12 | 京东方科技集团股份有限公司 | Display panel, display device and broken line repairing method |
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